[ http://issues.apache.org/jira/browse/LUCENE-762?page=all ]
Chuck Williams updated LUCENE-762:
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Attachment: SizeFieldSelector.patch
> [PATCH] Efficiently retrieve sizes of field values
> --------------------------------------------------
>
> Key: LUCENE-762
> URL: http://issues.apache.org/jira/browse/LUCENE-762
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Store
> Affects Versions: 2.1
> Reporter: Chuck Williams
> Attachments: SizeFieldSelector.patch
>
>
> Sometimes an application would like to know how large a document is before
> retrieving it. This can be important for memory management or choosing
> between algorithms, especially in cases where documents might be very large.
> This patch extends the existing FieldSelector mechanism with two new
> FieldSelectorResults: SIZE and SIZE_AND_BREAK. SIZE creates fields on the
> retrieved document that store field sizes instead of actual values.
> SIZE_AND_BREAK is especially efficient if one field comprises the bulk of the
> document size (e.g., the body field) and can thus be used as a reasonable
> size approximation.
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